Pulleys and Force

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Questions and Answers

What occurs to friction force once movement is achieved?

It decreases (correct)

It remains unchanged

It maintains

It increases

What is a necessary precaution when working with machine tools or equipment with rotating spindles?

Tying long hair back

Wearing gloves

Wearing jewelry and loose clothes

Removing jewelry and loose clothes (correct)

What is the most suitable alternative to mechanical fixings for a particular material and machine design?

Riveting

Clipping

Screwing

Welding (correct)

What is the primary function of a pulley?

To change the direction of applied force Signup and view all the answers

What is an obstacle to recycling timber?

The frequent need to remove ironmongery Signup and view all the answers

What type of friction is harder to overcome?

Static friction Signup and view all the answers

What is the purpose of combining machines together?

To form complex machines Signup and view all the answers

Why is it essential to remove jewelry and loose clothes when working with machine tools?

To prevent accidents and hazards Signup and view all the answers

What is the main purpose of a face shield?

To protect the face from flying chips and sparks Signup and view all the answers

Which of the following statements is NOT correct?

Machines can be combined together to form simple machines. Signup and view all the answers

What is the primary concern in any workshop or industrial setting?

Safety Signup and view all the answers

What type of machine is a seesaw?

A simple machine Signup and view all the answers

What is the purpose of welding in a machine design where mechanical fixings are not suitable?

To create a permanent joint Signup and view all the answers

What is the primary function of a machine?

To multiply and change the direction of a force Signup and view all the answers

What is the purpose of a pulley in a belt drive?

To change the direction of the belt Signup and view all the answers

What type of personal protective equipment must be worn when using machinery that gives off sparks or little parts?

Face shield Signup and view all the answers

What is elasticity in terms of material properties?

The ability of materials to retain their original shape after deformation Signup and view all the answers

What is a characteristic of a hammer?

It has only two components: a handle and a head Signup and view all the answers

What is the correct formula according to Newton's second law of motion?

Force = mass x acceleration Signup and view all the answers

What happens to the acceleration of an object if the net force doubles?

It doubles Signup and view all the answers

What is the relationship between the net force and acceleration according to Newton's second law of motion?

Acceleration is directly proportional to the net force Signup and view all the answers

What is the likely cause of a car or truck not responding when you accelerate or stumbling as it increases in speed?

Clogged fuel filter Signup and view all the answers

What is a property of force and acceleration?

They are vector quantities Signup and view all the answers

What happens to the acceleration of an object if the mass doubles?

It halves Signup and view all the answers

During which stroke does an engine likely fail due to too much air entering the cylinder?

Intake stroke Signup and view all the answers

What is the symbol 'm' in Newton's second law of motion?

Mass of the object Signup and view all the answers

What is the primary function of a soldering iron?

Heating and connecting metal objects together Signup and view all the answers

What is true about friction in the context of a car's performance?

Not all friction is harmful Signup and view all the answers

What is the result of a clogged fuel filter on a car's engine?

Restricted fuel flow and stumbling during acceleration Signup and view all the answers

What happens when too much air enters a cylinder during the intake stroke?

A lean mixture is created, which can lead to engine failure Signup and view all the answers

What is NOT a common use for a soldering iron?

Making holes or inserting and removing screws Signup and view all the answers

What is the opposite of a 'lean mixture' in an engine?

Rich mixture Signup and view all the answers

What type of machine is a doorknob an example of?

Wheel and axle Signup and view all the answers

What is the purpose of steel rods in concrete beams?

To resist internal tension forces within the cross section Signup and view all the answers

What type of machine is a waterwheel an example of?

Wheel and axle Signup and view all the answers

Why is concrete reinforced with steel rods?

Because concrete is weak in tension Signup and view all the answers

What system in cars allows them to automatically go over bumps and potholes?

Suspension system Signup and view all the answers

What tool is used to cut a circular piece to remove an intact core of material?

Hole-saw Signup and view all the answers

What is the benefit of a well-designed suspension system in cars?

Handling rough roads more comfortably Signup and view all the answers

What is the purpose of a hole-saw?

To cut a circular piece to remove an intact core of material Signup and view all the answers

Study Notes

Pulleys and Machines

A pulley is a device with a wheel that has a grooved rim in which a rope or belt can wind through.
Pulleys are used to change the direction of applied force and to control the tension and slack in a belt drive.

Machines

Machines are used to multiply and change the direction of a force.
Simple machines can be combined together to form complex machines.
Machines can be designed to increase speed through mechanisms like gears.

Safety Precautions

A face shield must be worn when using machinery that gives off sparks or little parts.
Jewelry, loose clothes, and other accessories must be removed when working with machine tools or other equipment with rotating spindles to prevent accidents and hazards.

Car Troubleshooting

If a car or truck doesn’t respond when you accelerate or stumbles as it increases in speed, the issue is likely related to the fuel filter.
A clogged fuel filter can restrict the flow of fuel to the engine, causing a lack of power and performance issues such as stumbling during acceleration.

Engine Issues

If the engine failed, it likely failed during the intake stroke because this is the phase where the air-fuel mixture is drawn into the cylinder.
If too much air enters, it can cause a lean mixture, which may lead to engine failure.

Tools and Equipment

A soldering iron is a hand tool used in soldering that supplies heat to melt solder so that it can flow into the joint between two workpieces.
A hammer is a versatile hand tool used for driving nails, breaking objects apart, or striking surfaces, consisting of a handle and a head.

Friction

Not all friction is harmful.
Friction force decreases once movement is achieved because starting movement (overcoming static friction) is harder than continuing it (overcoming kinetic friction).

Material Selection and Design

Welding is suitable for materials and machine designs where mechanical fixings are not suitable.
An obstacle to recycling timber is the frequent need to remove ironmongery and saw or plane off damaged edges, because this can make the process costly.

Newton's Second Law of Motion

Newton's second law of motion establishes a relationship between the net force acting on an object and its acceleration, considering the object's mass.
The correct formula for Newton's second law is: F = m × a

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Description

A multiple-choice question about pulleys, specifically about changing the direction of force and controlling tension and slack in a belt drive.